(19)

(11)

EP 0 681 628 A1

(12)

(43) Date of publication: 15.11.1995 Bulletin 1995/46 (21) Application number: 94902987.0 (22) Date of filing: 07.01.1994

(51) International Patent Classification (IPC):  E01F 9/ 014( . ) (86) International application number: PCT/GB1994/000027 (87) International publication number: WO 1994/016150 (21.07.1994 Gazette 1994/17)

(84) Designated Contracting States: DE FR GB (30) Priority: 07.01.1993 GB 19930000206 (71) Applicant: BLISS, Gareth, Ashby Rickmansworth, Hertfordshire WD3 2PD (GB)	(72) Inventor: BLISS, Gareth, Ashby Rickmansworth, Hertfordshire WD3 2PD (GB) (74) Representative: Mayes, Stuart David, et al  BOULT, WADE & TENNANT 27 Furnival Street London, EC4A 1PQ London, EC4A 1PQ (GB)